Applies To:

BIG-IP LTM

BIG-IP WOM

Overview: Installing a BIG-IP system without changing the IP network

A combination of several features of the BIG-IP®system makes it possible for you to place
a BIG-IP system in a network without changing the existing IP network. The following illustration
shows the data center topology before you add the BIG-IP system. The data center has one LAN,
with one IP network, 10.0.0.0. The data center has one router to the
Internet, two web servers, and a back-end mail server.

Data center example before adding a BIG-IP system

The existing data center structure does not support load balancing or high availability. The
following illustration shows an example of the data center topology after you add the BIG-IP
system.

Data center example after adding a BIG-IP system

Task summary

To configure the BIG-IP® system for this implementation, you must perform
a few key tasks. The example shown in the illustration is based on the use of the default
internal and external VLAN configuration with self IP addresses on each of the VLANs that are on
the same IP network on which you are installing the BIG-IP system.

Important: The default route on each content server should be set to the IP address
of the router. In this example, you set the default route to
10.0.0.2.

Task list

Removing the self IP addresses from the default VLANs

Remove the self IP addresses from the individual VLANs. After you create the VLAN
group, you will create another self IP address for the VLAN group for routing purposes.
The individual VLANs no longer need their own self IP addresses.

On the Main tab, click Network > Self IPs.
The Self IPs screen opens.

Select the check box for each IP address and VLAN that you want to
delete.

Click Delete.

Click Delete.

The self IP address is removed from the Self IP list.

Creating a VLAN group

VLAN groups consolidate Layer 2 traffic from two or
more separate VLANs.